Limits...
Synthesis, Characterization, and Biological Evaluation of a Dual-Action Ligand Targeting αvβ3 Integrin and VEGF Receptors.

Zanella S, Mingozzi M, Dal Corso A, Fanelli R, Arosio D, Cosentino M, Schembri L, Marino F, De Zotti M, Formaggio F, Pignataro L, Belvisi L, Piarulli U, Gennari C - ChemistryOpen (2015)

Bottom Line: In vitro binding assays on isolated integrin αVβ3 and VEGFR-1 showed that the dual-action conjugate retains a good level of affinity for both its target receptors, although with one order of magnitude (10/20 times) decrease in potency.The dual-action ligand strongly inhibited the VEGF-induced morphogenesis in Human Umbilical Vein Endothelial Cells (HUVECs).Remarkably, its efficiency in preventing the formation of new blood vessels was similar to that of the original individual ligands, despite the worse affinity towards integrin αVβ3 and VEGFR-1.

View Article: PubMed Central - PubMed

Affiliation: Dipartimento di Chimica, Università degli Studi di Milano Via C. Golgi 19, 20133, Milan, Italy.

ABSTRACT
A dual-action ligand targeting both integrin αVβ3 and vascular endothelial growth factor receptors (VEGFRs), was synthesized via conjugation of a cyclic peptidomimetic αVβ3 Arg-Gly-Asp (RGD) ligand with a decapentapeptide. The latter was obtained from a known VEGFR antagonist by acetylation at the Lys13 side chain. Functionalization of the precursor ligands was carried out in solution and in the solid phase, affording two fragments: an alkyne VEGFR ligand and the azide integrin αVβ3 ligand, which were conjugated by click chemistry. Circular dichroism studies confirmed that both the RGD and VEGFR ligand portions of the dual-action compound substantially adopt the biologically active conformation. In vitro binding assays on isolated integrin αVβ3 and VEGFR-1 showed that the dual-action conjugate retains a good level of affinity for both its target receptors, although with one order of magnitude (10/20 times) decrease in potency. The dual-action ligand strongly inhibited the VEGF-induced morphogenesis in Human Umbilical Vein Endothelial Cells (HUVECs). Remarkably, its efficiency in preventing the formation of new blood vessels was similar to that of the original individual ligands, despite the worse affinity towards integrin αVβ3 and VEGFR-1.

No MeSH data available.


CD spectrum of 2 (left) and 7 (right) in H2O (0.1 mm).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4608532&req=5

fig05: CD spectrum of 2 (left) and 7 (right) in H2O (0.1 mm).

Mentions: The CD spectra in water of compounds 2 and 7 are shown in Figure 5. The two curves have trends usually attributed to type β folding, in particular β-turn type II, characterized by two maxima: a positive maximum at ≈203 nm and a negative one at ≈226 nm. Similar spectra were observed in cyclic tripeptides known to adopt β-turn structures. Interestingly, the relatively modest differences of the two curves suggest that the PEG8 moiety does not alter significantly the structure of compound 7 with respect to the precursor molecule 2.


Synthesis, Characterization, and Biological Evaluation of a Dual-Action Ligand Targeting αvβ3 Integrin and VEGF Receptors.

Zanella S, Mingozzi M, Dal Corso A, Fanelli R, Arosio D, Cosentino M, Schembri L, Marino F, De Zotti M, Formaggio F, Pignataro L, Belvisi L, Piarulli U, Gennari C - ChemistryOpen (2015)

CD spectrum of 2 (left) and 7 (right) in H2O (0.1 mm).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4608532&req=5

fig05: CD spectrum of 2 (left) and 7 (right) in H2O (0.1 mm).
Mentions: The CD spectra in water of compounds 2 and 7 are shown in Figure 5. The two curves have trends usually attributed to type β folding, in particular β-turn type II, characterized by two maxima: a positive maximum at ≈203 nm and a negative one at ≈226 nm. Similar spectra were observed in cyclic tripeptides known to adopt β-turn structures. Interestingly, the relatively modest differences of the two curves suggest that the PEG8 moiety does not alter significantly the structure of compound 7 with respect to the precursor molecule 2.

Bottom Line: In vitro binding assays on isolated integrin αVβ3 and VEGFR-1 showed that the dual-action conjugate retains a good level of affinity for both its target receptors, although with one order of magnitude (10/20 times) decrease in potency.The dual-action ligand strongly inhibited the VEGF-induced morphogenesis in Human Umbilical Vein Endothelial Cells (HUVECs).Remarkably, its efficiency in preventing the formation of new blood vessels was similar to that of the original individual ligands, despite the worse affinity towards integrin αVβ3 and VEGFR-1.

View Article: PubMed Central - PubMed

Affiliation: Dipartimento di Chimica, Università degli Studi di Milano Via C. Golgi 19, 20133, Milan, Italy.

ABSTRACT
A dual-action ligand targeting both integrin αVβ3 and vascular endothelial growth factor receptors (VEGFRs), was synthesized via conjugation of a cyclic peptidomimetic αVβ3 Arg-Gly-Asp (RGD) ligand with a decapentapeptide. The latter was obtained from a known VEGFR antagonist by acetylation at the Lys13 side chain. Functionalization of the precursor ligands was carried out in solution and in the solid phase, affording two fragments: an alkyne VEGFR ligand and the azide integrin αVβ3 ligand, which were conjugated by click chemistry. Circular dichroism studies confirmed that both the RGD and VEGFR ligand portions of the dual-action compound substantially adopt the biologically active conformation. In vitro binding assays on isolated integrin αVβ3 and VEGFR-1 showed that the dual-action conjugate retains a good level of affinity for both its target receptors, although with one order of magnitude (10/20 times) decrease in potency. The dual-action ligand strongly inhibited the VEGF-induced morphogenesis in Human Umbilical Vein Endothelial Cells (HUVECs). Remarkably, its efficiency in preventing the formation of new blood vessels was similar to that of the original individual ligands, despite the worse affinity towards integrin αVβ3 and VEGFR-1.

No MeSH data available.